As some existing statistical channel models [1]}, [2]} are inaccurate when modelling channels of the local environment where UAVs are actually deployed.
To tackle this issue, we model the DNN-based BtU channel at time slot \(t\)  as follows:
\(h_{k}^{\rm B}(t) = G_{\rm B,v}(\mathbf {x}_{\rm B}, \mathbf {x}_{\rm v}(t)) G_r \bar{g}(\mathbf {x}_{\rm B}, \mathbf {x}_{\rm v}(t)) f_k^{\rm B}(t) \Delta \over = \frac{\theta _{k}^{\rm ul}(t)}{{{D}_{{\rm B,v}}^2(t)}},\) 
